Portable digital display unit



FIG. 1 is a front right perspective view of a portable digital display unit;

FIG. 2 is a front left perspective view thereof;

FIG. 3 is a rear right perspective view thereof;

FIG. 4 is a rear left perspective view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a top view thereof; and,

FIG. 9 is a bottom view thereof.

The broken line showing of a rear portion of the portable digital display unit is for the purpose of illustrating environment and forms no part of the claimed design. 

CLAIM The ornamental design for a portable digital display unit, as shown and described. 